40717185581 has 2 divisors, whose sum is σ = 40717185582. Its totient is φ = 40717185580.

The previous prime is 40717185521. The next prime is 40717185629. The reversal of 40717185581 is 18558171704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39269763556 + 1447422025 = 198166^2 + 38045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40717185581 is a prime.

It is a super-2 number, since 2×40717185581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40717185521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20358592790 + 20358592791.

It is an arithmetic number, because the mean of its divisors is an integer number (20358592791).

Almost surely, 2^40717185581 is an apocalyptic number.

It is an amenable number.

40717185581 is a deficient number, since it is larger than the sum of its proper divisors (1).

40717185581 is an equidigital number, since it uses as much as digits as its factorization.

40717185581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 313600, while the sum is 47.

The spelling of 40717185581 in words is "forty billion, seven hundred seventeen million, one hundred eighty-five thousand, five hundred eighty-one".